The Michigan Freight Plan provides a comprehensive overview of the state's freight transportation system, including existing assets, system performance and investments needed to "ensure long-term success," MDOT officials said in a press release.

The plan also provides a framework for freight system improvements and priorities. MDOT will accept feedback on the plan through Sept. 29.

The department also will hold a public webinar about the plan's details on Sept. 12.

More than 479 million tons moved to, from, within and through Michigan in 2014. Trucking accounted for 65 percent of tonnage moved, while rail handled 21 percent, according to the plan.

Coal, chemical products and metallic ores were the top commodities moved by rail in 2014.